# Copyright (c) 2018 ARM Limited
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#
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# this software without specific prior written permission.
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from m5.SimObject import *
from m5.params import *

# QoS scheduler policy used to serve incoming transaction
class QoSPolicy(SimObject):
    type = "QoSPolicy"
    abstract = True
    cxx_header = "mem/qos/policy.hh"
    cxx_class = "gem5::memory::qos::Policy"


class QoSFixedPriorityPolicy(QoSPolicy):
    type = "QoSFixedPriorityPolicy"
    cxx_header = "mem/qos/policy_fixed_prio.hh"
    cxx_class = "gem5::memory::qos::FixedPriorityPolicy"

    cxx_exports = [
        PyBindMethod("initRequestorName"),
        PyBindMethod("initRequestorObj"),
    ]

    _requestor_priorities = None

    def setRequestorPriority(self, request_port, priority):
        if not self._requestor_priorities:
            self._requestor_priorities = []

        self._requestor_priorities.append([request_port, priority])

    def setMasterPriority(self, request_port, priority):
        warn(
            "QosFixedPriority.setMasterPriority is deprecated in favor of "
            "setRequestorPriority. See src/mem/qos/QoSPolicy.py for more "
            "information"
        )
        self.setRequestorPriority(request_port, priority)

    def init(self):
        if not self._requestor_priorities:
            print(
                "Error,"
                "use setRequestorPriority to init requestors/priorities\n"
            )
            exit(1)
        else:
            for prio in self._requestor_priorities:
                request_port = prio[0]
                priority = prio[1]
                if isinstance(request_port, str):
                    self.getCCObject().initRequestorName(
                        request_port, int(priority)
                    )
                else:
                    self.getCCObject().initRequestorObj(
                        request_port.getCCObject(), priority
                    )

    # default fixed priority value for non-listed Requestors
    qos_fixed_prio_default_prio = Param.UInt8(
        0, "Default priority for non-listed Requestors"
    )


class QoSPropFairPolicy(QoSPolicy):
    type = "QoSPropFairPolicy"
    cxx_header = "mem/qos/policy_pf.hh"
    cxx_class = "gem5::memory::qos::PropFairPolicy"

    cxx_exports = [
        PyBindMethod("initRequestorName"),
        PyBindMethod("initRequestorObj"),
    ]

    _requestor_scores = None

    def setInitialScore(self, request_port, score):
        if not self._requestor_scores:
            self._requestor_scores = []

        self._requestor_scores.append([request_port, score])

    def init(self):
        if not self._requestor_scores:
            print("Error, use setInitialScore to init requestors/scores\n")
            exit(1)
        else:
            for prio in self._requestor_scores:
                request_port = prio[0]
                score = prio[1]
                if isinstance(request_port, str):
                    self.getCCObject().initRequestorName(
                        request_port, float(score)
                    )
                else:
                    self.getCCObject().initRequestorObj(
                        request_port.getCCObject(), float(score)
                    )

    weight = Param.Float(0.5, "Pf score weight")